单项选择题
Cumulus clouds that have undergone vertical development and have become cumulonimbus in form，indicate（）.
A.clearing weather
B.that a warm front has passed
C.probable thunderstorm activity
D.an approaching hurricane or typhoon
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Cumulonimbus clouds are formed by（）.
A.vertical air movements
B.heavy rainstorms
C.horizontal air movements
D.any movement of moist air -
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Corrosive liquids and acids should have which kind of label?（）
A.Skull and crossbones
B.Yellow and white
C.Red and white
D.White and black -
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Conventional anchors are least likely to hold in a bottom consisting of（）.
A.soft clay
B.hard mud
C.very soft mud
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